===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.6/6755 is trying to release lock (rcu_read_lock) at: [] __wait_on_freeing_inode+0x105/0x350 but there are no more locks to release! other info that might help us debug this: 4 locks held by syz-executor.6/6755: #0: ffff88800fb683f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88800bc3e330 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fb6c950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 stack backtrace: CPU: 1 UID: 0 PID: 6755 Comm: syz-executor.6 Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_unlock_imbalance_bug+0x118/0x130 lock_release+0x1ee/0x270 __wait_on_freeing_inode+0x10a/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x623/0xb40 vfs_symlink+0x44b/0x840 filename_symlinkat+0x158/0x440 __x64_sys_symlink+0x82/0x110 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5151ed427 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd3182b638 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff5151ed427 RDX: 00007ffd3182b713 RSI: 00007ff51524802f RDI: 00007ffd3182b700 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd3182b4d0 R10: 00007ffd3182b387 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd3182b700 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.6/6755 Modules linked in: CPU: 1 UID: 0 PID: 6755 Comm: syz-executor.6 Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 Code: f2 02 00 00 c7 43 58 01 00 00 00 bf 09 00 00 00 e8 d6 b7 de ff 4d 85 f6 0f 84 73 fe ff ff e8 38 8a 20 00 fb e9 68 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e e9 81 4d 74 03 e8 2c 5d 56 00 e9 RSP: 0018:ffff888037bdf9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88800f3fd280 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88800f3fd67c RBP: ffff88800f3fd280 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800f3fd280 R13: 0000000000000001 R14: ffffffff85c0dd30 R15: ffff88801a372938 FS: 0000555586f35400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555586f35708 CR3: 000000001a731000 CR4: 0000000000350ef0 Call Trace: __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x623/0xb40 vfs_symlink+0x44b/0x840 filename_symlinkat+0x158/0x440 __x64_sys_symlink+0x82/0x110 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5151ed427 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd3182b638 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff5151ed427 RDX: 00007ffd3182b713 RSI: 00007ff51524802f RDI: 00007ffd3182b700 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd3182b4d0 R10: 00007ffd3182b387 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd3182b700 irq event stamp: 945 hardirqs last enabled at (945): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (944): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (940): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (938): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop3: detected capacity change from 0 to 64 FAT-fs (loop3): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop4): unable to read boot sector FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 UID: 0 PID: 6765 Comm: syz-executor.0 Tainted: G W 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 __kmalloc_cache_noprof+0x80/0x730 __ipv6_dev_ac_inc+0x355/0xd80 ipv6_sock_ac_join+0x8b5/0x1190 do_ipv6_setsockopt+0x3f8c/0x47f0 ipv6_setsockopt+0xcb/0x170 udpv6_setsockopt+0x84/0xd0 do_sock_setsockopt+0xf7/0x1e0 __sys_setsockopt+0x11f/0x1a0 __x64_sys_setsockopt+0xbe/0x160 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fba269f9b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fba23f6f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fba26b0cf60 RCX: 00007fba269f9b19 RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000004 RBP: 00007fba23f6f1d0 R08: 0000000000000014 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007fff93f20bff R14: 00007fba23f6f300 R15: 0000000000022000 FAT-fs (loop6): unable to read boot sector FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 6768 Comm: syz-executor.2 Tainted: G W 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 __kmalloc_noprof+0xd6/0x830 sock_kmalloc+0x108/0x170 ipv6_sock_ac_join+0x230/0x1190 do_ipv6_setsockopt+0x3f8c/0x47f0 ipv6_setsockopt+0xcb/0x170 udpv6_setsockopt+0x84/0xd0 do_sock_setsockopt+0xf7/0x1e0 __sys_setsockopt+0x11f/0x1a0 __x64_sys_setsockopt+0xbe/0x160 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa918612b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa915b88188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fa918725f60 RCX: 00007fa918612b19 RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000004 RBP: 00007fa915b881d0 R08: 0000000000000014 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fffc51469df R14: 00007fa915b88300 R15: 0000000000022000 FAT-fs (loop4): unable to read boot sector FAT-fs (loop3): unable to read boot sector FAT-fs (loop6): unable to read boot sector FAT-fs (loop4): unable to read boot sector FAT-fs (loop3): unable to read boot sector FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 UID: 0 PID: 6804 Comm: syz-executor.2 Tainted: G W 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 kmem_cache_alloc_noprof+0x80/0x760 dst_alloc+0x9c/0x650 ip6_create_rt_rcu+0x2ad/0x560 ip6_pol_route_lookup+0xc40/0x1dc0 fib6_rule_lookup+0x277/0x300 rt6_lookup+0x162/0x230 ipv6_sock_ac_join+0x3d5/0x1190 FAT-fs (loop6): unable to read boot sector do_ipv6_setsockopt+0x3f8c/0x47f0 ipv6_setsockopt+0xcb/0x170 udpv6_setsockopt+0x84/0xd0 do_sock_setsockopt+0xf7/0x1e0 __sys_setsockopt+0x11f/0x1a0 __x64_sys_setsockopt+0xbe/0x160 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa918612b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa915b88188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fa918725f60 RCX: 00007fa918612b19 RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000004 RBP: 00007fa915b881d0 R08: 0000000000000014 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fffc51469df R14: 00007fa915b88300 R15: 0000000000022000 loop4: detected capacity change from 0 to 64 FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 6814 Comm: syz-executor.0 Tainted: G W 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 kmem_cache_alloc_noprof+0x80/0x760 fib6_add+0xf77/0x25b0 ip6_ins_rt+0xb5/0x110 __ipv6_dev_ac_inc+0x91a/0xd80 ipv6_sock_ac_join+0x8b5/0x1190 do_ipv6_setsockopt+0x3f8c/0x47f0 ipv6_setsockopt+0xcb/0x170 udpv6_setsockopt+0x84/0xd0 do_sock_setsockopt+0xf7/0x1e0 __sys_setsockopt+0x11f/0x1a0 __x64_sys_setsockopt+0xbe/0x160 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fba269f9b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fba23f6f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fba26b0cf60 RCX: 00007fba269f9b19 RDX: 000000000000001b RSI: 0000000000000029 RDI: 0000000000000004 RBP: 00007fba23f6f1d0 R08: 0000000000000014 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007fff93f20bff R14: 00007fba23f6f300 R15: 0000000000022000 FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop3): unable to read boot sector